An engaging popular science book that examines how little we understand the internal experiences of people generally — not only those diagnosed with schizophrenia. What is thought? How do scientists study thought? This book also provides an introduction to the Hearing Voices movement, a civil rights movement for self-identified voice-hearers that has emerged over the last three decades. Fernyhough contemplates the voices “heard” by creative writers such as myself, and closely examines several historical and literary examples of this other sort of voice hearing.